Gun for spraying powder



Feb. 15, 1949. D. L. LOTT 2,461,611

GUN FOR SPRAYING POWDER Filed March 3, 1947 III lm'iimlll'lm "in II] IIIIII! 1h INVENTOR 04v/0 A. Low- A TTORNE 1/.

Patented Feb. 15,1949 V v 2,461,611

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Figure 1 is a side eIevation o'f'the devl'ce; material so far as theoperation o'fthe dfust dls 25 are jointed together at point 21, as shownin Figure 4 and therefore air or othermaterial passing through the tubeswill combine and be discharged through the outer end of tube 25, whichprojects beyond the point 21. A removablecap 28 serves to close theouter end of the housing '8 and is held in place by means of two rods 29and 38 that are connected at one end with cap 12 and after passingthrough cap 28 are provided with wing nuts 3!, which serve to urge thecap 28 into airtight sealing engagement with the end of the housing. Ifdesired, a suitable gasket may be provided between the inner surface ofcap 28am! the end of the cylinder ill, but since such gaskets are commonfor this purpose, it has not been illustrated.

Referring now to Figure. 3, it will be observed that the passage frommanifold l1 branches, one branch communicating with pipe 24 and theother with pipe 25. -At the point where these two branches begin, avalve 32 is provided and mounted for rocking movement about pivot 33.One position of valve 32 has'been indicated by full lines and anotherposition by dotted lines. When valve 32 is in the full line positionshown in Figure 3, any air leaving manifold i! will be directeddownwardly through the connector 28 and thence outwardly through tube25. The latter is provided with an opening 34 adjacent which is locateda screen 35. The pivot on which valve 32 turns extends through the wallof tube 24 and into a sealed chamber 38% whose wall has been designatedby reference numeral 31. Secured to the end of pivot 33 that terminatesin chamber 38 is an arm 38 to the end of which is secured a weight 39.In the-finished device, compartment 36 is entirely closed so that nodust or air from the outside can enter the same. It will be apparentthat if the dust gun is held in such a way that the end towards the leftin the drawing is upwardly inclined, the action of weight 39 will movevalve member 32 into the full line position shown in Figure 3 andtherefore direct the current of air through pipe 25, whereas, if thedust gun is held in such a position that the end to the left isdownwardly inclined, weight, 39 will move into the dotted line positionshown in Figure 4 and this, in turn, will move valve 32 into the dottedline position, thereby closing the passage to tube 25 and opening thepassageto tube 24. v

A partition is provided to the rightof man1- 'fold IT- as shown inFigure 3 and this forms a wall that prevents any powder from gettinginto that space between the manifold and partition "40. Opening 34 ispositioned to the left of partition 48 "asshown most clearly in Figure4. Cap 28 may be removedentirely from the housinglfor the purpose ofcharging the chambenwith powder or it may be provided with an openinghaving a removablecover 4!. A short tubular discharge nozzle 42 ispositioned in an opening in cap 28 inaxial alignment withtube 25 and isadjustthrough the outer end of tube 25.

able inwardly and outwardly for the purpose of adjusting the rate ofdischarge, of the powder.

Let us now assume that the parts are assembled in the manner abovedescribed and that the compartment between cap 28 and partition 48 ispartially filled with a. fine powder. The powder containing compartmenthas been designated by P so as to be more readily referred to. If thefire or other object to which the powder is to be applied is positioned:'at a low elevation, the gun is pointed downwardly, whereupon weight 39and arm 38 operate to move valve 32 from the full line to the dottedline position. The air will then-pass through tube 24 and into tube 25at point 21. Since the gun is pointed downwardly, the powder willnaturally be resting against the inner surface of cap 28 and the streamof air emerging from tube 25 and escaping through tube 42 will entrainpowder which will emerge in a stream and can be directed to whateverobject may bedesired. If the gun is used for applying an insecticide toplants,-the stream of powder will naturally be directed onto the plantand if. ;fire extinguishing powder is used, the stream of powder will bedirected onto the fire. If, for any reason, the objectto which thepowder is to be applied is at an elevated position, the operator willnaturally point the gun upwardly, whereupon weight 39 and arm 38 willmove valve 32 to full line position shown in Figure 3. Any air that isnowdischarged from the pump or other source of air under pressure willpass through the part 28 through the screen and past opening 34, beingdischarged finally since the powder is resting against the outer surfaceof partition 48 when the gun ispointed upwardly, some of the powder willenter tube 25 through opening 34 and will be carried along by the streamof air and finally discharged from the gun, together with the air streamin which it is entrained. A screen 35 is positioned to the right ofopening 34 for the purpose of preventing powder from enteringtheconnecting-passage 28 when the gun is not in use.

In Figure 3 the flat valves 23 have been shown as positioned inside ofthe cylinder where they would be likely-to be interfered with by the cupleathers. ,In order to prevent such injury, the piston rod has beenprovided with a shoulder-43 and a projection 44 that serve as stopspreventing the piston from engaging the valves. Any other suitablearrangement may, of course, be used and other-equivalent valves may besubstituted for the ones shown.

From the above description, it will be apparent that the dust gun thatforms the subject of this invention is of such aconstruction that it can-be used either for directing powder upwardly or downwardly and that theconstruction is such that the tubescan not readilybe'come clogged duringoperation, or during thetime when the gun is being transported.

"Wallis serves" the double iunction 'bian end closure for the'p'ump'cylihder' ahd "anen'd' wall for the dust compartment P." In theer'nbpdi inent illustrated, wall '40 art san end well of the dustchamber, its presence, however. is due to the fact thatin its absence agre ter quantity of powder would benecessary when the gunis operated inanupwardly directed position. Wall 43 may, however, be dispensedwith andppening 34 brought closer .to partition I3 which can be e -b qbv sh ees-Having described the invention what is claimed as new is:

1. A dust gun comprising, an elongated housing closed at both ends, anair manifold near one end, a branched discharge opening in the Wall ofthe manifold, a tube extending from one of the branches to a point nearthe other end of the housing, the wall of the housing having a discharge nozzle in substantial axial alignment with the open end of thetube, a second tube communicating the other branch of the dischargeopening with the first mentioned tube at a point adjacent the dischargeend of the latter, a valve means positioned in the discharge opening fordirecting air from the manifold to either tube, a gravity responsivemeans for positioning the valve to direct an air stream into the firstmentioned tube when it is upwardly inclined and into the secondmentioned tube when the parts are downwardly inclined, the firstmentioned tube having its wall provided with an opening adiacent thevalve, and means for supplying the manifold with air under pressure.

2. A dust gun comprising an elongated housing forming a dustcompartment, walls closing the ends of the housing, an air manifoldadjacent one end Wall, the inner wall of the manifold having a branchedopening, a tube having one end in communication with one of saidbranches, the other end terminating a short distance from the inside ofthe other end wall, a tubular discharge nozzle extending through the endwall, terminating adjacent to and in substantial axial alignment withthe open end of the tube, a second tube communicating the other branchof the manifold opening with the first mentioned tube, the firstmentioned tube having an opening in its wall adjacent the end incommunication with the manifold opening branch, means for supplying themanifold with air under pressure, meansfor directing air from themanifold into the first mentioned tube when the gun is upwardly inclinedand into the second tube when it is downwardly inclined, said meanscomprising a valve member in the branched opening, and means comprisinga gravity responsive operating device for moving the valve member inresponse to the angular position of the gun.

3. A dust gun comprising, an elongated housing whose ends are closed bytransverse inner and outer walls, the inner wall being transverselyinclined, a closed manifold chamber positioned outside of the inclinedend wall, the wall of the manifold adjacent the inclined wall having abranched discharge opening, means for supplying air under pressure tothe manifold, a tube having its inner end in communication with one ofthe branches through an Sl-shaped connector, the other end of the tubeterminating adjacent the inner surface of the outer wall, a tubularnozzle extending through the outer wall in axial alignment with thetube, the wall of the tube having an opening positioned adjacent theinside of the inner end wall, and a gravity responsive valve mechanismfor directing air into the first mentioned tube when the gun is upwardlyinclined and into the other tube when the gun is downwardly inclined.

DAVID L. LOTT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 954,398 MacGregor Apr. 5, 19101,194,781

Pearsons Aug. 15, 1916

